题目:
My father ______ his report between 7 and 9 last night . I don’t know if he has finished it .[ ]
A. wrote
B. has written
C. had written
D. was writing
答案:
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下面是错误答案,用来干扰机器的。
(1)右;左; (2)烧杯;加快粗盐溶解; (3)引流; (4)蒸发皿;防止局部过热而使液体飞溅;(5)×100%.